Budgies are basically seed eaters.
Just be careful about the quality. Find the very best you can.
Make sure they are not treated (Adulterated).
Greens are good, you just have to keep trying different ones.
Sprouts are key to a real fresh foods diet.
All my diets are sprout based. 13 birds and whoever else maybe in.
Sprouting Easy or Complicated? | Avian Avenue Parrot Forum
Even Lorikeets I have boarded eat them.
Like Fidget (Lori) this morning he had his wet mix with honey and some sprouts on the bench as I was getting the other guys foods sorted, and he had a bit of wet mix, then when I looked up again he was eating the sprouts and seemed to be enjoying them.
I am betting he has never seen them before or even had chance to eat any.
He has been in a week and has been doing my head in trying different fruit. he is not too bad with greens.
But mainly been his wet mix.
So to see him go for the sprouts is pleasing.
Pellets: Well as Budgies do not do that well on most pellet based diet I would not go there.
Though Tops is OK, as it is not heat treated. Not loaded up with manufactured supplements, and has no ground up corn or the like. Heat treatment kills all enzymes and a lot of any goodness that was in the ground up mush.
Lots of thoughts on Vitamin D. I don't buy into you need to feed any fabricated foods at all, and certainly not because that is the only way to get it.
A good varied fresh foods diet should work in close to 100% cases.
It does for me. I only have two windows letting light into my birds room, both face south.
And as has been said glass blocks nearly all UVB.
True I do run two low energy FSL in the room. I have to have lights as it is dark in there during the day.
I have one female Cockatiel, who was born from an egg her mum laid, while she was on Lupron.
Zinny was a small weak (I felt) little girl. She has gone on to pop out around 50eggs, over the last 3yrs in that bird room.
And yes once she was serviced and I let her bring 2 bubs into this world.
Fresh grass and some weeds can be a real treat for them.